Question

Is there way to customize TabBar like this?
We use iOS5.

Answer 1

Yes this isn’t actually to difficult to do.

1) Subclass UITTabBarController

2) Run a method to hide all UITabBar class elements like below

3) Draw your own elements onto self ([self.view addSubview:CustomButton])

for(UIView *subview in self.view.subviews) {
    if([subview isKindOfClass:[UITabBar class]]) {
        subview.hidden = YES;
        break;
    }
}

EDIT

As a further update to explain how your image example is done. You have 4 elements:
1) Background image
2) Left button
3) Middle button
4) Right button

So UIImageView and UIButton with [UIButton buttonWithType:UIButtonTypeCustom] are all you need for this magic to happen.